My dishwasher will not drain. It is a Whirlpool DU1100 and the pump sounds like it is comming on and working but the water will not drain. Once I removed some of the water it will start to fill but will not drain.

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see this causes and fix it. God bless youDrain Pump
If the dishwasher is loud during operation,
the drain pump might be defective or might have some debris in it. This
is a common problem.
Circulation Pump
If the dishwasher is loud during operation,
and the noise is a continuous drone similar in speed to the circulation
pump sound, it's likely that the circulation pump motor bearings have
failed. Once this happens the circulation pump will have to be replaced,
the bearings are not repairable.

Drain Impeller
If the dishwasher is loud during operation,
the drain impeller might be broken, or there might be debris in the
pump. Generally, to gain access to the pump the top of the pump housing
will have to be removed.

Pump and Motor Assembly
If the dishwasher is loud the motor bearings,
drain impeller or wash impeller might have worn out. All three of these
components are part of the pump and motor assembly. It may be possible
to replace one of the impellers, but the motor bearings cannot be
repaired. In that case the pump and motor assembly will need to be
replaced.

Wash Impeller
The wash impeller is a small, plastic blade.
The motor spins the impeller forcing water through the spray arms to
clean the dishes. If one or more blades has broken off of the impeller
the dishwasher is loud. The impeller can also scrape against the pump
housing if it is damaged, warped or bent.

Circulation and Drain Pump Motor
If the dishwasher is loud during operation,
and the noise is a continuous drone similar in speed to the motor sound,
it's likely that the circulation and drain pump motor bearings have
failed. Once this happens the motor will have to be replaced, the
bearings are not repairable.

Water Inlet Valve
The water inlet valve is an electrically
controlled water valve. When it is new, the water inlet valve is very
quiet. Over time, the diaphragm inside the valve deteriorates and
deforms. This deformation interacts with the water rushing in and can
cause a loud vibration, buzzing, squealing or other noises. If the
dishwasher is loud during the filling cycle, replacing the water inlet
valve may solve the problem.

your Whirlpool dishwasher stopped draining mid-cycle, check your circuit breaker or fuses. The cycle won't complete if the power is interrupted. Reset the circuit breaker if tripped, or change out any blown fuses. Fully close the dishwasher door, and restart the cycle if you opened up the door. If you have not used the dishwasher in a while, the motor may be stuck. Open up the main housing, and rotate the motor until it turns freely. You must replace the motor if it's corroded or won't move since it's unlikely that you can fix it.

Pump

The pump is located underneath the lower rack and spray arm. This component is responsible for pumping water out of the dishwasher once the cycle is complete. If the pump isn't working, verify that it is not clogged with debris. Use a toothpick or plastic utensil to remove food particles from it. Check the pump impeller. If a section of it is broken, get a new pump since the impeller is difficult to fix.

Clogs

Clogs in the air gap or drainage hose prevent water from leaving the tub. Clean these components and the water inlet filters, if dirty. Examine the drainage hose, and straighten it if it's kinked. If the hose is badly crushed, you must replace it. Unscrew the drainage hose from the dishwasher to clean it, but reattach it before you restart the cycle. Run the food waste disposer if it's connected to your Whirlpool dishwasher. Remove the knockout plug from the disposer if you have just installed the disposer or dishwasher.

Drain Valve/High Drain Loop

Whirlpool dishwashers have drain valves with an internal solenoid. This valve opens and closes to drain water out of the tub. If the drain valve is stuck, lubricate the lever, and remove any debris clogging the valve. Remove any objects that are preventing the drain valve from freely opening and closing. If the valve is not working properly, you must replace it. Always install a high drain loop to prevent water from the sink entering your dishwasher. Create a loop of the drainage hose that is at least 18 inches high. Attach this hose beneath a section of cabinetry.

MOD DU943PWKB0 WHIRLPOOL PROBLEMS
My Whirlpool dishwasher is not working. I pulled it out and when I leaned it forward it seemed to work once againe, but once I placed it back into it's slot it would not come on. Checked the wiring and everything seems fine. Unsure of what i should do.

DWF 415 Ikea Whirlpool Dishwasher has constant green blinking light. Drain pump works ok (as it will pump out a jug of water if I tip it into it!) but no water comes in. Cycle stops about 30 seconds after thre is no more water to pump. Any ideas on how to fix?

I had this problem with the ADP5406 too, but managed to solve it. Here's what I did.
First I turned the dishwasher off at the mains.
The dishwasher was full of dirty water so the first thing was to drain this. I managed to lift the dishwasher up onto a couple of buckets
to let gravity do the work of draining the water out of the drain hose and into a bucket.
I then unclipped the plastic lower front of the dishwasher. To do this tilt the dishwasher back a bit and release the fairly obvious
clips underneath the wide plastic part at the base of the front of the dishwasher. Once this is off you will need to undo 4 torx screws
to remove the lower metal access panel. Once this is removed you will be able to see the drain pump. Be very careful at this point since
all the metal in the dishwasher is unfinished and extremely sharp. It's like working with 30inch long Stanley knife blades all around
your hands! The drain pump is at the front, just left of centre and attaches directly to the sump. To detatch it, first unplug the plug
that supplies it with power. Once this is unclipped, press the tab in on the edge of the pump so that you can turn it anticlockwise to
undo it. It should come out in your hand now enabling you to pull the impeller out of it and give it a good clean. My pump was full of
mush and grime and seemed to be stopping it from working properly. Refitting everything is a straightforward reversal of removal. Good
luck.

Yes, you can pull one of the pump's leads to find whether the noise comes from the pump.
You should unplug machine's power cable first and be sure that the disconnected wire is isolated.
Before replacing the pump look that it clean from any foreign object/
Good luck!